/*
 * Copyright (c) 2022 Huawei Device Co., Ltd.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import { MathUtil } from './MathUtil';

/**
 * @private
 */
export class StringUtil {

    /**
     *
     * @param {string} text
     * @param {string} pattern
     * @return {boolean}
     */
    static startsWith(text, pattern){
        return text.indexOf(pattern) === 0;
    }

    /**
     *
     * @param {string} text
     * @returns {number}
     */
    static hashCode(text) {
        const len = text.length;
        if (len === 0) {
            return 0;
        }

        let hash = 0;
        for (let i = 0; i < len; i++) {
            const chr = text.charCodeAt(i);
            hash = ((hash << 5) - hash) + chr;
            hash |= 0; // Convert to 32bit integer
        }
        return MathUtil.smi(hash);
    }
}

